Device and method for testing thermal stability of optical axis of optical lens

Abstract

The present invention is a test device and method for the thermal stability of the optical axis of an optical lens. The device includes an optical platform, a star simulator, an imaging assembly, a temperature control and clamping device, a detection circuit, and a drawing calculation device; the imaging assembly Including optical lens and detector components; the star simulator, imaging assembly, temperature control and clamping device are all placed on the optical platform during the test; the light emitted by the star simulator is imaged on the detector assembly in the imaging assembly; The temperature control and clamping device is used to clamp the imaging assembly, and the temperature change of the imaging assembly is controlled through the built-in electric heating plate or oil pipeline facilities of the temperature control and clamping device; the optical lens in the imaging assembly is used as the test The unit under test gathers the light from the target source and forms an image on the detector assembly; the detection circuit is connected to the detector assembly in the imaging assembly for image formation control and output; the image acquisition computing device is connected to the detection circuit and used Acquisition, recording and analysis of images.

Description

technical field [0001] The invention relates to a test device and method for the thermal stability of the optical axis of an optical lens, belonging to the field of space star sensor test. Background technique [0002] The thermal drift of the space star sensor is the main source of its low-frequency error, and it is of great significance to enhance the thermal stability of the star sensor to improve its accuracy. The thermal stability of the star sensor can be further decomposed into the main optical-mechanical structure of the imaging link, such as optical lens, detector components, mechanical structure, etc. Among them, the thermal stability of the optical lens is particularly important, and its accurate measurement is the premise of improving the design of the optical lens and enhancing the thermal stability. [0003] The thermal stability of the optical axis of an optical lens refers to the ability of the optical axis of the optical lens to resist the influence of temp...

AI Technical Summary

Problems solved by technology

[0005] However, the conventional test method is for the overall measurement of the combination of lens and detector components. Under temperature changes, the position of the star point on the image surface of the detector changes. On the one hand, it can be caused by the change of the optical axis of the optical lens, on the other hand , the photodetector will also cause thermal deformation with temperature changes, which in turn will lead to changes in the position of the imaging star point

Therefore, the measurement results of the conventional method include the influence of the thermal deformation of the image plane of the detector on the change of the star point imaging position, which represents the overall thermal stability level of the assembly, not the characteristics of the optical lens itself, and the measurement error is relatively large

Images